MONITORING METHOD OF AXIAL LOAD ON BIT AT TURBINE DRILLING Russian patent published in 2012 - IPC E21B44/00 E21B47/14 

FIELD: oil and gas industry.

SUBSTANCE: monitoring method of axial load on bit at turbine drilling of the well equipped with drill pump, delivery line, drilling hose, gooseneck, swivel, drill column, turbo-drill, bit, with ground rejection filter additionally arranged in delivery line of drill pump, acoustically rotating rejection filter rigidly attached through shaft of turbo-drill to turbo-drill and bit, hydrophone with measuring equipment between swivel with gooseneck and drilling hose. It includes drill pump for supply of flushing fluid via drill column to turbo-drill, via delivery line, via drill column from drill pump to turbine blades of turbo-drill and brings into rotation of shaft turbo-drill rigidly connected to the bit. At that, frequency band in the spectrum generated with drill pump, ground rejection filter arranged in delivery line is converted; broad-band acoustic spectrum with constant amplitude is generated with turbine blades; broad-band acoustic spectrum is generated with impacts of teeth of roller cutters against mine rock, with varying amplitude dependent on the bit load; frequency band is converted as per amplitude from total acoustic spectrum consisting of spectra generated with turbine blades and impacts of teeth of roller cutters against mine rock to the range of low frequencies by means of amplitude-pulse modulation with acoustic rotating rejection filter arranged on turbo-drill shaft; at the same time, monitoring of the changing bit load is performed through hydrophone connected to measuring equipment as per varying amplitude of acoustic waves converted by means of amplitude-pulse modulation of low frequency range with acoustic rotation rejection filter.

EFFECT: improving monitoring reliability of bit axial load at turbine drilling.

1 ex, 10 dwg